Files say Read-Only Server 2012

hey guys,

we have Server 2012 std here with some basic file shares. There's about 10 users using windows 7 access the files.

Now when users open some files, it say's that it's already open and they need to open a read-only copy even when no one else has it open. What could be causing this?
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Cliff GaliherCommented:
The most common culprit is antivirus software not designed to servers. Since client OSes don't have multiple users, an AV can get away with holding locks on behalf of a user. But on a multiuser server, thus wreaks havoc. There are utilities that can let you view open file handles. I believe sysinternals even has one.
Cobra25Author Commented:
There's no av, but there is carbonite installed.
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