Hi :)
My own personal views from observations, NOT TDF's view and nothing to do with anyone else involved with LibreOffice is as follows. Check the voracity for yourself. Don't rely on what people spoon-feed you!
There are 2 problems in play.
1. Any document in any editable format will display differently on different machines with different printers attached and different settings&configurations.
2. MS is unable to follow a standard. Even the so-called standards they created themselves. The OOXML is implemented differently in each of their versions such that a document written in MS Office 2007 may well display differently in MS Office 2010 on the same machine. If you install 2010 yourself then you might notice their disclaimer that even on the same machine if you have 2 versions of their OS, say Xp and Win7, then MS Office 2010 documents may well be different on each. None of their implementations seem to match the ISO standard they managed to push through as an ISO format.
As for their attempts to follow the ODF they carefully went for the old 1.1 version when everyone else had already moved to ODF 1.2. Their reasoning sounded solid. The 1.2, despite having been in use for years, had not been fully released and was still being called a beta release. So, MS Office 2010's 'support' for ODF was based on an ancient format that no-one was still using at the time.
If you look back at the court case about MS's "RTF" format which they had designed to allow all programs to be compatible with each other then you might notice similarities with the current situation with their OOXML format.
MS are a profit making company and they need to find ways to get people to buy their new versions. 'Accidental' incompatibilities with their older formats pushes everyone to buy their newer versions at around the same time in order to be able to read/write each others documents. The MS formats are subject to radical change at the whim of 1 single profit-making company.
Of course any program has a few issues but when they are spotted in LibreOffice it's easy to post a bug-report about it. If MS's implementation of their format is a bit off then it's practically impossible to post a bug-report or get anyone to listen to the problem
The only formats that currently seem to truly work just fine across all different programs are the older MS formats. The ones that don't end in X, so NOT DocX, XlsX and the rest of the OOXML ones. The ones that do seem to work best are the Doc, Xls and so on. However, ODF is starting to be used more often by more people. For longer-term storage of documents it might be wise to store them in ODF but for current active collaborations the Doc, Xls and so on are more widely used at the moment.
The ODF ISO standard is set and agreed by an independent organisation called OASIS. Many different companies, including TDF, have at least 1 person sitting on the board at OASIS in order to make sure that there is agreement about the standard itself and acceptable variances in it's implementation. It's not going to suddenly change if IBM release a new version of Lotus Symphony. So it's a lot more stable, predictable and reliable. Also because it's implementation matches the standard that has been written up, published and fairly easy for everyone to access it means that the format is 'always' going to be possible to read certainly for longer than the old Rtf, Doc, or DocX. So the future is ODF.
Regards from
Tom 
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