Implementing Canonicals on Existing ASP Ecommerce Store with Pagination

[Sean_Dawes]

So I have a store which has been around for a while and is custom built on ASP.net.  Store has thousands of sku's and at least a few hundred subcategories.

Have been tackling a bunch of the onsite issues and for categories which have more than 6 products in them, there are multiple pages and a view all present.

Example.com/category

example.com/category?PageIndex=2

example.com/category?PageIndex=3

example.com/category?PageIndex=4

example.com/category?viewall=True

As well as the following for every page

example.com/category?PageIndex=2&viewall=True

So I know how I wish to handle the pagination/canoncial issue as per google's suggestions you do it to the view all or they have the rel=next/prev.

But my question is google says if view all is present they should already do a good job at ranking the view all version. Well in the rankings, there are a lot of page1 variations showing.

So once this is implementated, is it safe to assume that I will see a drop?  Feel like if it was a brand new site it is easy but for something this old and established, it could cause some decent harm which at the current time we are already tackling a massive list of issues which in the long haul will improve it.

Looking for some insight for someone who has dealt with ASP.net and this specific area.

thanks
Sean

[GeorgiaSEOServices]

Wow, ok. So this is a very tricky question with a lot of unknowns. There was a thread similar to this in the Google Forums a while back and I think the person you really need to talk to is Maile Ohyo. Check out this thread that deals with your problem (and much more). It should answer your question, but if not, you can find Maile on Google+.

http://productforums.google.com/forum/#!topic/webmasters/YbXqwoyooGM