Exchange 2003 FE and BE (Enterprise Ed) SP2 patched and installed on Server 2003. (We are moving to a new exchange platform within a few weeks but need mail flowing to mobiles ASAP on current platform).
Office Outlook 2010 Client and 2003 Outlook Web Access and mail flow between all these and external flow in/out is fine, however no mobile phones Android / Windows / iPhone, etc.. are able to sync anything with the server, this is effecting all 550 mobiles the company uses, no common theme / manufacturer etc...
Sometimes rebooting the server starts mail syncing but swiftly stops again and errors and warnings resume in the event log.
This happened a few weeks ago and a simple re-booot solved the issue but no even the reboot only gets it working for a few mins then the errors and warnings resume
# Re-installing SP2 on both FE and BE Servers and web searching the issue heavily but nothing matches the issues
# Rebooting both FE and BE servers
# disabled on access AV scanning as a test on the FE server
# Disabling FBA forms based auth as a test
# Checked iis connection limits if any
Event log on FE Exchange server full of 3007, 3005 and 3014 Errors/Warnings