Err/sys Mailbox locked by another server?

cheekymolecheekymole Forumite
3.4K Posts
Can anybody help me out on this one please?
All of a sudden I keep getting this error

ERR/SYS-Mailbox locked by another server.

Sometimes I can access my mail and other times I can't. This only happens on my desktop i.e. not on the laptop so it's obviously something to do with that (maybe?)

My server is Tiscali and I use Incredimail (I suppose it could be that)
I haven't got one!
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