Nov 4 (Reuters) - GBST Holdings Ltd GBT.AX
* Asx alert-GBST partners with MainstreamBPO to enter BPO market,MAI-gbt.ax
* Entered business process outsourcing market through a partnership with MainstreamBPO Limited
* Partnership to provide outsourced wealth administration and registry services for large-scale fund managers and custodians Source text for Eikon: Further company coverage: GBT.AX