Dr. Hasib and deba_avik, thanks a lot for your replies.
So you guess I'm safe with IELTS of 7.5, right? (I mean I don't need to retake the test?). By the way, how much is IETLS basic score?
To tell you the truth, I'm rather suspicious of the wording in update email form VO. And I guess nobody here wants to give VO a good excuse to reject our cases by misinterpreting their request. So I tried to decipher (word-by-word) the important points as follows. Everybody (especially senior members, experts) feel free to correct and comment.
Good luck!
Dear Applicant,
This refers to your application for permanent residence in Canada as a Skilled Worker.
Canada's Immigration and Refugee Protection Regulations require that applicants provide all information and documents required for the assessment of their applications. The selection criteria are clearly defined, and your eligibility for permanent residence as a Skilled Worker will be assessed on the basis of the documents and information you provide. The onus is on you to provide sufficient evidence to demonstrate that you meet the requirements.
You are now being given an opportunity to update your application before it is assessed by an officer. Please submit the documents and information specified below to our office by mail. You have sixty (60) days from the date of this letter to comply with this request.
If the requested evidence is not received by our office within this timeframe, your application will be assessed on the basis of the information on file. So technically speaking, if you truly have no update information, you don't have to resend anything, and VO will assess your case based on your full documents submitted 1 year or so before. You will not be given a further opportunity to provide more information.
Updated Application Forms: So the following 4 forms is a must, right? The following forms can be completed on the CIC website:
Generic Application Form for Canada (IMM 0008) form, completed with updated information
Schedule A Background/Declaration (IMM 5669) form, completed with updated information for you and all dependants 18 years and older, with original signatures all questions must be answered if a question is not applicable, write N/A do not leave any gaps in your personal history and address history you must provide details from the age of 18 to the present
Additional Family Information (IMM 5406) form, completed with updated information for you and all dependants 18 years and older
Schedule 3 Economic Classes - Federal Skilled Workers (IMM 0008) form, completed with updated information Ensure you provide accurate occupational codes from the National Occupation Classification which most closely describe your work experience over the past ten years
Updated Identity, Status, and Civil Documents:
Provide the following documents
only if there have been changes since you initially submitted your application:
"only if", so it's not mandatory, right? If passports have been renewed or replaced, provide a copy of the passport information page(s) for each person included on the application
If the immigration status of you or any person included on the application has changed, provide a copy of the current visa or status document of the country where you are (lawfully) residing, as applicable
If there have been any marriages, divorces, deaths, or births for you or any person included on the application, provide copies of civil documents as applicable examples: marriage/divorce/death/birth certificates, child custody/adoption orders note: to add a spouse or child to your application, you will need to pay the application fee for them
Updated Photographs: Surely my face has been changing quite a lot due to long-time waiting's frustration, so I guess I will send the updated photos Updated identification photographs for you and all accompanying dependants which comply with the photo specifications available in the SW Application Guide - Appendix A
Updated Education and Experience Documents:
quite clear below, right? No additional studies or work experience, so there's no need.If you have completed additional studies since you initially submitted your application and you would like those studies to be counted toward the award of points for education, please provide for you and your spouse (if accompanying):
Copies of transcripts showing courses completed and grades earned
Copies of degrees, diplomas, or certificates
If you have accumulated additional experience in one or more occupations at NOC Skill Level O, A, or B for which you would like consideration, please provide for all occupations in which you wish to be assessed:
Original letter(s) from your employer(s) which clearly describe your job duties and responsibilities
Copies of letter(s) of offer or employment contract(s)
Copies of salary statements or pay stubs
Copies of income tax returns
If you are self-employed, copies of business registration and/or license and proof of business conducted with clients, such as orders and invoices, balance sheets, income tax returns
Proficiency in Canada's Official Languages:
If you are claiming English and/or French language skills on your application,
you must provide conclusive proof of your language skills:
we're all claiming points by IELTS, right? so we must retake and resend IELTS 
The wording here is pretty ambiguous, don't you think? VO should add some more clarification at this point. For example, if you would like to upgrade your score, etc.....? if you don't wish to, etc..... Submit the original reports of a language test by an approved organization (International English Language Testing System (IELTS) or the test d'ιvaluation de franηais (TEF))
test results must not be more than one year old at the time of submission So, obviously the initial IELTS result's copy (no more original, right?) is no use now. we have to retake ?!! Adaptability Factors:
If you or your accompanying spouse has a relative in Canada, provide:
It's unclear here too. What if I have a relative, and I had submitted all necessary documents regarding that relative, do I have to resend this time? Proof of your relationship to them (e.g. birth certificates showing parentage)
Proof of their status in Canada (copy of permanent resident card, citizenship certificate, or Canadian passport)
Proof that they are currently residing in Canada (e.g. recent utility bill, salary statement, or tax return in their name, sent to their residential address in Canada)
If your or your accompanying spouse has studied or worked in Canada, provide documents issued by the educational institution or employer which provide details, as well as copies of any work or study permits issued by Citizenship & Immigration Canada
Settlement Funds:
Provide original financial documents (e.g. bank statements, term deposit statements)
for the past 6 months showing transactions for all your accounts as proof of unencumbered funds for prospective settlement in Canada any large deposits must have clearly documented provenance to show the funds are yours.
So submission of the most recent financial documents is a must, obviously. Arranged Employment in Canada:
If you have been offered a job by a Canadian employer, and that employment offer has been approved by Human Resources & Skills Development Canada (HRSDC):
Submit a copy of the Arranged Employment Opinion (AEO) issued by HRSDC and a copy of the employment offer
Any additional information and documents for consideration when your application is assessed must be received by this office within sixty (60 days) from the date of this letter. If you need more time, you must advise this office immediately and provide detailed reasons. Your request will be considered, but there is no guarantee that an extension will be granted. If no further evidence is received within this timeframe, your application will be assessed on the basis of the information on file.
This may lead to the refusal of your application. This is the most intimidating sentence of all. Only 1 misstep or 1 insufficient document or 1 misinterpretation, and rejection letter is sure to come. I believe that VO is purposedly using this update-technique (with some vague and ambiguous instructions) to buy more time and eliminate more applicants just by catching our mistakes. So, keep vigilant, my friends!! 
If you wish to withdraw your application, please advise our office immediately in writing. You may be eligible for a full refund of the processing fees paid. Once we begin assessing your application, it will no longer be possible to refund the processing fees.
Yours truly,
Counsellor (Immigration)
This is a computer-generated letter which requires no signature.
Immigration Forum
