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About a year ago I changed from Windows to OSX. I had purchased several postcript and truetype fonts for Windows and needed up upgrade these to opentype versions. Fortunately, most of my purchased fonts were standard or pro opentype fonts.
I discovered some companies allow font upgrades and others do not. Adobe and Monotype do not (at least beyond 30 days, per their tech support). However Storm, Teff, HF&J and others do. I would prefer to purchase future typefaces from foundries that allow upgrades (for a price) rather than require complete repurchase of fonts. Does anyone have a list of foundries which do not forget about you after 30 days?