Problems with CMYK Colours changing to LAB

We have a problem at work.
In our office we work with CS6(illustrator and indesign). We save our documents on a server so my colleague can see the things I design and change things. Here's our problem. When I save documents with the right pantone colors on my imac they change on my colleague's imac to LAB colors when he opens the documents. So he has to change the colors again to CMYK.
Does this have anything to do with the differences between our color libraries or maybe updates?
I hope someone can help us, it will save us a lot of changing colors!

You have to create two documents. One Spot color. One CMYK Process color.  Distribute the CMYK Process version on the server and leave the Spot version on your local machine ( to be sent to the print vendor ). Another option is to distribute the CMYK version as a PDF.  Unfortunately, when you distribute to a server and other people have the opportunity to open and edit your documents, these type of deviations happen.  So, you have to play smart and distribute something everyone can read as accurate.  If I were you, in the copy of the original, create swatches using the CMYK conversion numbers you are accustomed to and comfortable with.  But, as previously posted, Spot color with remain Spot color and will print as Spot color.  It's just the color communication that is getting skewed by the software and different users, different systems, etc.  I hope you are the captain of the ship and noone else is dealing with the print vendor.  Otherwise, you might have a real mess on your hands.

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