lost email – help from Support recovered some ,but some very important emails still missing

Dear Support

Thank you for your help on a previous post regarding emails that were lost over almost an 18 month period. I was able to locate some of these in my POP folder. However, others that were lost since the upgrade to Outlook from Hotmail still cannot be found, and some of these are very important.

I am still unable to find emails between 26/06/13 and 07/11/12, it is quite urgent for me to locate some work related emails.

I would appreciate any help you can offer in this matter.

Many Thanks