Hello again. I am about to restart this Office-kerning-error discussion since I have new inputs.
It is still very rare that fonts exported from Glyphs App (also 2.4) works well in Microsoft Office, no kerning. And yes, the Office software is NOT well-made, I know, but some clients are all into PowerPoint :-/
The latests fonts I have designed I have exported from Glyphs (.otf) and afterwards I have opened the .otf in the newest test-version(free) of FontLab VI, and then exported .ttf from there, without changing anything, just open and export.
And magically the fonts works very well in Office, kerning and all. So I guess that this is going to be my work flow when designing typefaces for clients that are using Office, until the FontLab part is no longer necessary, when Glyphs export well to Office.