A word of caution here: be careful when pasting with Microsoft Project. If you are copying data from MS Project and pasting elsewhere, then it should work and be harmless, but be especially careful when copying and pasting into MS Project.
For example, if you paste dates (Start, Finish) into MS Project, it will impose scheduling constraints on those tasks, which may cause you grief. Also, try not to copy entire task rows in MS Project, as it may cause problems with duplicate IDs behind the scenes. Instead, copy ranges of cells… not entire rows.