MSVCR90.dll relates to visual studio studio 2008 C++ but most likely this is not the cause of your issue but it may be worth trying to reinstall it if it appears to be missing.
Cause: Windows Updates
FIX: Recent windows updates (Office Service Packs) have now altered the way Microsoft Outlook works and the client now defaults to using outlook in online mode. This breaks the email functionality for some reason most likely because the ID of the .OST file changes each time (guess)
Super easy fix : Set outlook to Use Cached Exchange Mode
In Outlook left hand pane - > right click your email and goto data File properties and then the Advanced Tab - Make sure Use Cached Exchange Mode is ticked. hit OK close and restart outlook and retry your dynamics GP emails.
hope it helps, I was going banana's trying to figure it out :)
extra: If windows updates has broken your adobe printer also checkout my other post on this issue, you can find it from the search