We run '03 at the office, and 'upgraded' to '07. Within a few weeks, everyone went back to '03, as we found the newer version was not kind to some of the older computers re they ran way slower. Painfully slower.

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95 E300D gave away
77 300D, 227k, station car
83 300CD 370k, body gone away to the rust gods, engine is in a Yota pickup, going strong
89 190E 2.6- 335k, no more
79 VW FI Bus- 154k summer driver
59 VW Beetle ragtop- 175k
12 VW Jetta- 250k
74 MG Midget-78k