By Amy-Jo Crowley, Anousha Sakoui and Oliver Hirt LONDON/ZURICH (Reuters) – Bain Capital is the last remaining bidder for software company SoftwareOne Holding AG after other interested parties, including private equity firm Apax Partners, dropped out, three people familiar with the situation said. This makes buyout group Bain the frontrunner to acquire the Swiss software manager after it first emerged as a bidder back in June. Spokespeople for Bain, Apax and SoftwareOne declined to comment. SoftwareOne received at least four non-binding bid proposals, as part of a strategic review, including f…