It syncs instantly with exchange on a mobile phone like an iPhone.

Done John with no luck and not in cached mode. Running Exchange 2010 which i'm not 100% familiar with yet so not sure if i cocked something up in there when having a fiddle yesterday :boggle:

Cached mode?

Not seen that problem before but creating a new ost normally fixes calendar problems for me.

In outlook I have the calendars of all my site admins, normally however you leave it, the next time you turn it on those calendars are up (say I have 2 admins up and my own when I leave, the next time I start outlook those will remain)

Until today, I seem to always have "Admin 1" appear alongside my own but not the ones I left open. Whats more confusing is he isn't ticked on the left, when I tick and un tick he goes. Then if I flick from calendar to inbox and then back to calendar he reappears.

Uninstalled, deleted temp files, reinstalled, logged into different machines and its doing the same thing. Any ideas ?