You may be confused by the error in Excel saying another user. Actually Excel cannot tell who (the real human) is editing the file. Based on my research the No.1 possibility of the error is KB2626998.
2626998 Connection to a network document is lost in the 2007 Office system or in Office 2010 after the computer resumes from standby
http://support.microsoft.com/kb/2626998
For Excel 2010, follow these steps:
a. Click Start , click Run , type regedit in the Open box, and then click OK .
b. Locate and then select the following registry subkey: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Excel\Options
c. On the Edit menu, point to New , and then click Dword Value .
d. Type NetworkAvailableTimeInSeconds , and then press Enter.
e. Right-click NetworkAvailableTimeInSeconds , and then click Modify .
f. In the Value data box, click Decimal , type a number value, and then click OK .
Note This registry subkey sets the time, in seconds, that Excel waits for the network to resume. For example, if you type 15 for the number value, Excel waits 15 seconds for the network to resume. You might have to do some tests in your own environment to
determine an appropriate value. You may have to try multiple numbers.
g. Locate and then select the following registry subkey.
HKEY_CURRENT_USER\Software\Microsoft\office\14.0\common\Internet
h. Repeat step 2C through step 2F again. Reuse the same value that you used previously.
i. Exit Registry Editor.
Feel free to post back. Thanks.
Cheers,
Tony Chen
Forum Support
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Marked as answer by
Tony Chen CHNMicrosoft contingent staff, Moderator
Friday, August 16, 2013 2:33 AM