Excel filesize 0k

thanks in advance, but i have a handful of excel 2007 users who will save a

file to the server that they've made many modifications to, or just created,

but the filesize reflects 0k. No pattern other than the same version of

Excel. it's happened on a win2k server (i know), a Sharepoint site, and a

win8k server. we've installed wireshark to analyze traffic, but that hasn't

provided us any results yet. We also brought in Premier Support, but it's

such a random issue that we haven't made any traction yet. thanks much for

any replies.

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ken