[ms office - 2013] high contrast funny in excel

[E_G_R2]

Hi,

 

we have a visually impaired user who has recently started to use high contrast mode so that they can see the screen more easily.

 

They are using Windows 7 and office 2013.

 

When in Excel if they make any changes in formatting to the cells using the auto function (say for cell/table boarders) to a existing document that was using black, when the document is saved and then opened in no high contrast the boarders have changed colour and the spread sheet is unusable by other users.

 

any suggestions?