With more people using Office365 every day, it can be helpful to have a few troubleshooting tools nearby. I had issues sending files over Lync IM and found this helpful download during my research. It verifies the local PC client configuration and is able to apply minor repairs for common configuration issues. Something to keep nearby as we all support more Office365 users.
http://support.microsoft.com/kb/2386684
- Desktop or Application sharing can’t connect in a Lync Online conference
https://technet.microsoft.com/en-us/library/hh852475.aspx
- Download MOSDAL (Microsoft Online Services Diagnostics and Logging) Support Toolkit




