+ 0 Votes Well just the obvious things OH Smeg 3 years ago This particular file isn't being open by more than one person at a time or this person isn't trying to open it several times in the same session is she? That will cause corruption. Col + 0 Votes Thanks! jschuett 3 years ago Thanks for all of the feedback I have been trying to do everything suggested here, of course since it is an intermittant issue I will have to sit back and wait to see if it happens again. + 0 Votes Ensure same version of Excel is used kmdennis 3 years ago Try getting her a new or different computer with similar version of Excel installed. (eg. if Pro, install pro). Next try saving the file with a password. Next save to two separate locations or three if necessary; such as one local, one to another file server. Verify that the antivirus scanner is not causing the corruption. And turn on auditing of the folder and file. + 0 Votes Try copying only the data into a different sheet nagapavan 3 years ago You could try copying only the data into another sheet and this could help you if you have a problem of the file size increasing after every instance of saving the workbook. I have experienced this whn my file size went up to 40 MB. I copied the data and pasted in a new file and the size of the new file was 32 KB. + 0 Votes Always work the sheet locally and back it up to the network share MasterTech 3 years ago I would suggest that she copy the Excel workbook to her local drive and perform all modifications there. At the end of each work day, she should copy it to the mapped drive so it can be backed up. Working with large data sources natively across the network can result in regular corruption issues. + 0 Votes Thanks! jschuett 3 years ago Thanks for all of the feedback I have been trying to do everything suggested here, of course since it is an intermittant issue I will have to sit back and wait to see if it happens again.