Exchange 2003 stopped pushing emails to phones

I have one 2003 with Exchange 2003, all patched, worked ok for years, then yesterday users report they no longer getting emails on their phones around midnight, iPhone or Androids, nothing were changed or added, no updates, theres nothing unusual on the event viewer, and the phones can still get internet off the router, the certificate is a SelfSSL with 2 years left so its not expired, anyone have any clues to where to look on this one ?
Thanks
CombemartinAsked:
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
Please have a read through my article and check all your settings:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_1798-Exchange-2003-Activesync-Connection-Problems-FAQ.html

Make sure you don't have Microsoft Security Essentials on the server as it breaks Activesync!  If it is on there - get rid if it asap.

Alan
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Nick RhodeIT DirectorCommented:
OWA still work?
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donnkCommented:
check your not low on disk space.
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