# Gradual migration from vBulletin

**URL:** https://meta.discourse.org/t/gradual-migration-from-vbulletin/46044
**Category:** Support
**Created:** [June 19, 2016, 11:56pm UTC](https://meta.discourse.org/t/gradual-migration-from-vbulletin/46044 "2016-06-19T23:56:08Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![codinghorror](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/codinghorror/32/110067_2.png) [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [June 20, 2016, 4:42am UTC](https://meta.discourse.org/t/gradual-migration-from-vbulletin/46044/2 "2016-06-20T04:42:22Z")

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Every time we have seen people run new and old discussion / forum systems in parallel, it has been an unmitigated disaster. Highly not recommended.

Either warn of the switch in advance, and fully switch, or don’t. Running old and new systems in parallel causes both to fail.

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_[View the full topic](https://meta.discourse.org/t/gradual-migration-from-vbulletin/46044)._